I took the liberty to edit your post and add in the photo from the following page.

Wow, that's pretty impressive. My kids and into LEGOs and there is a huge group called AFOLs, which is Adult Fans of Legos and those are the types of people that love that stuff. I'm not sure I would have the patience to do something on that scale, but I might be willing to take part once or twice in a big building program.